Super capacitor energy storage type power quality compensator

Abstract

The invention relates to a super capacitor energy storage type power quality compensator. A system structure comprises a compensation transformer, a series compensator, a parallel compensator, a super capacitor group, a current foldback circuit, a bidirectional DC / DC chopper circuit, a signal sampling circuit, a control circuit, a drive circuit, a human-computer interface and corresponding auxiliary circuits, which form a three-phase three-wire system topological structure. By utilizing the excellent characteristics of great power density, high charging and discharging speed and long cycle life of a super capacitor, the super capacitor energy storage type power quality compensator is matched with the DC / DC chopper circuit to form an energy storage control system which plays the roles of adjusting power and stabilizing the voltage of a direct current bus in work. The invention also has the functions of dynamic voltage recovery, active filter and reactive compensation and can ensure that a load can obtain rated sine voltage and the current of a grid is sine current with the same direction (unit power factor) with that of a voltage fundamental wave positive sequence active component, thereby comprehensively improving the quality of power. The invention has positive generalization and application value for both the public grid and users.

Description

【Technical field】 [0001] The invention relates to the technical field of user power in power quality control, in particular to a supercapacitor energy storage type power quality compensator. 【Background technique】 [0002] From a technical perspective, power quality includes two aspects: voltage quality and current quality. Voltage quality refers to the deviation between the actual voltage and the ideal voltage, reflecting whether the power supplied by the power supply enterprise to the user is qualified, including voltage swell, voltage sag, voltage fluctuation, three-phase unbalance and voltage interruption, etc.; Take the current to put forward the requirements of constant frequency and sinusoidal waveform, and make the current waveform and the supply voltage have the same phase to ensure that the system supplies power with high power factor. Current quality problems include harmonics, reactive current, and three-phase current imbalance. The power quality problem actual...

AI Technical Summary

Problems solved by technology

UPQC has changed the traditional voltage or current waveform compensation method in power quality management, and it adapts to the compensation requirements of system current and voltage as a whole, and has a long-term development prospect. As the number of times increases, the life of the capacitor will be shortened quickly

In addition, due to the small energy storage capacity of ordinary capacitors, it is difficult to play the role of UPS

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